Displaying really poor photographs on their AW profiles - dark, out of focus, sideways, not showing their body clearly, etc etc.
British girls are often the worst offenders here - a lot of them need to raise their game if they want to compete with the foreign girls. I'm not talking about photoshopping - I hate that - but just posing somewhere where the light is good (near a window, outdoors maybe - though not in strong sunlight). The annoying thing is that with modern digital cameras anybody can take good photographs. All they need to do is shoot a couple of hundred and choose the best dozen. It doesn't have to be an SLR - a compact camera would be fine or even a phone would be OK at a pinch. Given that it's so crucial to their business and so easy to do I can't understand why more of them don't get it right.